Does time exist outside of the Now???

Is there a past? Is there a future.? Is it just all now, in this moment. Without the observer is there a world? What is the true nature of things? We forget as we grow older, so how can we expect a rendition of remembered history to be accurate when we can’t even remember our own childhood.

This brings the question that if we change out perspective and shift our belief system does the past and the present change.